CN115386779A - Ceramic phase and high-melting-point phase synergistically enhanced high-entropy alloy coating and preparation method thereof - Google Patents
Ceramic phase and high-melting-point phase synergistically enhanced high-entropy alloy coating and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a ceramic phase and high-melting point phase synergistically enhanced high-entropy alloy coating and a preparation method thereof.
Description
Technical Field
The invention relates to the field of coatings, in particular to a ceramic phase and high-melting-point phase synergistically enhanced high-entropy alloy coating and a preparation method thereof.
Background
High entropy alloys are systems composed of at least five major elements forming a complete solid solution in a mixture of equal or unequal atomic numbers, whereas conventional alloys are composed primarily of one or two elements. The previous researches show that the high-entropy alloy material has the outstanding performances of high entropy, difficult atomic diffusion, easy obtainment of a solid solution phase with a relatively simple crystal structure, high hardness, high temperature resistance, excellent wear resistance, good oxidation resistance and the like, so that the high-entropy alloy material becomes a potential application and can be used as a protective coating of a metal material.
TiC has good physical and chemical properties, including high strength and corrosion resistance, making it an excellent reinforcing phase for the preparation of metal matrix composites. Δ H of Ti and C compared with other high melting point elements mix The lowest value, therefore Ti and C tend to combine and form TiC. The TiC reinforcing coating is added in the composite material preparation process to complete the utilization of the TiC reinforcing coating. However, the wettability between the reinforcing phase and the matrix is a main factor influencing the preparation process, and poor wettability can cause poor interface bonding, resulting in material fracture. In addition, interface reaction and atomic diffusion are easy to occur between the reinforcing phase and the matrix, and the mechanical property of the composite material is seriously influenced. While the in situ generated consolidation stage may avoid the above disadvantages.
Generally, the melting point and the Young's modulus of the high-melting-point element are far higher than those of other forming elements, and the composite material can have higher melting point and Young's modulus by adding the high-melting-point element, so that the composite material has higher thermal stability and strength. In addition, the high-melting point element is dissolved in the matrix in a solid way, so that the lattice distortion is enhanced, and the mechanical property of the coating is improved. Therefore, the development of the high-entropy alloy reinforced by the cooperation of the ceramic phase and the high-melting point phase is of great significance.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a ceramic phase and high-melting-point phase synergistically enhanced high-entropy alloy coating and a preparation method thereof.
In order to achieve the purpose, the invention is realized by the following technical scheme:
one aspect of the present invention provides a high entropy alloy coating synergistically enhanced by a ceramic phase and a high melting point phase, comprising: the coating is coated on a substrate, the total thickness of the coating is 0.3-1.5mm, the coating is composed of a solid solution phase, a ceramic phase and a high-melting-point phase, the constituent elements of the solid solution phase are Fe, al, co, cr and Ni, the constituent elements of the ceramic phase are Ti and C, the high-melting-point phase is composed of X, and the constituent elements of X are one or more of Mo, nb, ta, V or W.
Further, the solid solution phase component element Fe is diluted by the matrix, the molar ratio of the solid solution phase component elements Al, co, cr and Ni is 1.
Further, the substrate is carbon steel.
Furthermore, the coating is prepared by mixing Al, co, cr, ni, ti, C and X and then performing laser cladding.
According to one aspect of the invention, a preparation method of a high-entropy alloy coating cooperatively enhanced by a ceramic phase and a high-melting point phase is provided, and comprises the following steps:
s1: polishing the surface of the substrate by using abrasive paper, and drying the polished substrate for later use;
s2: weighing Al, co, cr, ni, ti, C and X powder according to a molar ratio, then uniformly mixing, uniformly coating the alloy powder on the surface of a matrix by using a binder, wherein the thickness of a prefabricated layer is 0.3-1.5mm, and after coating, airing and drying;
the X powder is at least one of Mo, nb, ta, V or W powder;
s3: and (3) performing laser cladding preparation by using a laser body as a heat source to obtain the ceramic phase and high-melting-point phase synergistic enhanced high-entropy alloy wear-resistant coating.
And step S1, sequentially using 80#, 180#, 320#, and 600# SiC sand paper to polish the surface of the substrate in the step (1), polishing the surface of the polished collector body, cleaning, blow-drying, and drying.
The substrate is carbon steel.
The substrate is Q235 steel.
The drying conditions in the step S1 are preheating in a drying box at 200 ℃ for drying for 2 hours, and the drying conditions in the step S2 are preheating in the drying box at 70 ℃ for drying for 2 hours; the uniform mixing mode in the step S2 is that the V-shaped powder mixer performs uniform mixing for 2 hours.
In the step S2, the molar ratio of Al, co, cr and Ni is 1.
The binder in the step S2 is water glass;
preferably, the coating is prepared to have a thickness of 0.3-1.5mm.
Preferably, the coating preparation thickness is 1.0mm.
Preferably, the powder ratio is that the molar ratio of Al, co, cr and Ni is 1.
In step S3, the laser cladding process parameters are as follows: the scanning speed is 15-24mm/s, the power is 1000-2000W, the protective gas flow is 10L/min, the defocusing amount is 35mm, and the overlapping rate is 30%.
Preferably, the power is 1000W, and the scanning speed is 18mm/s.
The laser cladding adopts a YLS-10000 laser processing system.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a high-entropy alloy prepared by laser cladding and cooperatively enhanced by ceramic phase and high-melting-point phase
The coating method realizes the combination of the laser cladding technology and the advanced high-entropy alloy material, overcomes the problem that the material is easy to break due to wettability in the traditional process, and promotes the wide application of the high-entropy alloy in the surface engineering of the material.
2. The ceramic phase and the high-melting-point phase prepared by the invention are cooperated to enhance the high-entropy alloy coating, so that the wear resistance and the corrosion resistance of the coating are obviously improved.
3. The ceramic phase and the high-melting-point phase prepared on the surface of the matrix are cooperated to enhance the high-entropy alloy coating, so that the hardness and the wear resistance of the matrix material can be effectively improved.
Drawings
FIG. 1 is a flow chart of a preparation method of a ceramic phase and high-melting-point phase synergistically enhanced high-entropy alloy coating provided by the invention;
FIG. 2 is an XRD diffraction pattern of the AlCoCrFeNiMo (TiC) high-entropy alloy coating prepared by the embodiment of the invention;
FIG. 3 is a diagram of the upper middle gold phase of the AlCoCrFeNiMo (TiC) high-entropy alloy coating prepared by the embodiment of the invention;
FIG. 4 is a bar graph of hardness data of AlCoCrFeNiMo (TiC) high-entropy alloy coatings prepared by the embodiment of the invention;
FIG. 5 is a bar chart of abrasion weight loss of Q235 steel and AlCoCrFeNiMo (TiC) high-entropy alloy prepared by the embodiment of the invention, wherein the right bar chart in the bar chart is the abrasion loss of the Q235 steel, and the left bar chart in the bar chart is the abrasion loss of the AlCoCrFeNiMo (TiC) high-entropy alloy coating;
FIG. 6 is a zeta potential polarization curve of Q235 steel and AlCoCrFeNiMo (TiC) high-entropy alloy prepared by the embodiment of the invention, wherein the curve on the right side in the figure is the zeta potential polarization curve of the Q235 steel, and the curve on the left side in the figure is the zeta potential polarization curve of the AlCoCrFeNiMo (TiC) high-entropy alloy coating.
Detailed Description
The invention is further described with reference to the accompanying drawings and the specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The embodiment is as follows: preparation of high-entropy alloy coating cooperatively enhanced by ceramic phase and high-melting-point phase
(1) Substrate pretreatment
(1) The substrate material adopts a Q235 steel block with the size of 50mm multiplied by 6mm, and the surface of the substrate is sequentially polished by 80#, 180#, 320# and 600# SiC sand paper to obtain the polished substrate.
(2) And cleaning and drying the polished substrate, and then placing the substrate in a drying box for preheating at 200 ℃ for drying for 2 hours for later use.
(2) Pre-formed powder
(1) Selecting seven element powders of ceramic phase elements Al, co, cr, ni, ti and C and a high-melting point element Mo, wherein the powder purity is more than 99.9%, the particle sizes are all 100-200 meshes, and after the powder is weighed according to the molar ratio of 1.
(2) Preparing an alloy coating by adopting a prefabricated powder method, coating the uniformly mixed powder on the surface of a matrix by using water glass, airing and drying after the coating is finished, wherein the drying temperature is 70 ℃, and the drying time is 2 hours.
(3) Laser cladding:
a YLS-10000 laser processing system is adopted, a laser body is used as a heat source, cladding is carried out under the conditions that the scanning speed is 18mm/s, the power is 1000W, the protective gas flow is 10L/min, the defocusing amount is 35mm, and the lap joint rate is 30%, and the ceramic phase and the high-melting-point phase cooperatively enhanced high-entropy alloy wear-resistant coating is obtained.
The microstructure of the ceramic phase and high-melting point phase synergistically enhanced high-entropy alloy coating prepared in the embodiment is characterized by using an ultra-depth-of-field microscope, the microhardness of the coating is measured by using a microhardness meter under the conditions of 200g and 15s of holding time, a corrosion test is carried out on the coating in 3.5 wt% of NaCl solution by using a three-electrode electrochemical workstation (Gamary Interface 1000), and a potentiodynamic polarization curve is tested under the conditions that the potential variation range is-1.0V-0.5V (vs OCP) and the scanning speed is 0.5 mV/s.
Fig. 2 is an XRD diffractogram of the AlCoCrFeNiMo (TiC) high entropy alloy coating prepared in this example, and it can be seen from fig. 2 that the phases of the coating are composed of BCC phase and TiC, and no diffraction peak of intermetallic compound occurs.
FIG. 3 is a diagram of the upper middle gold phase of the AlCoCrFeNiMo (TiC) high-entropy alloy coating prepared by the embodiment of the invention, and it can be seen from FIG. 3 that the metallographic structure of the coating is fine isometric crystal, and TiC generated in situ is distributed in the grain boundary and the crystal.
FIG. 4 is a graph of the average hardness of AlCoCrFeNiMo (TiC) high-entropy alloy coatings prepared by the embodiment of the invention, and from FIG. 4, the hardness of the AlCoCrFeNiMo (TiC) high-entropy alloy coatings is 68.0HRC. The hardness of the coating is high, and the dispersion strengthening effect of the in-situ autogenous TiC particles and the solid solution strengthening effect of the high-melting-point elements synergistically improve the hardness of the AlCoCrFeNi-based high-entropy alloy.
FIG. 5 is a bar graph of the wear weight loss of Q235 steel and AlCoCrFeNiMo (TiC) high-entropy alloy prepared by the embodiment of the invention, and as can be seen from FIG. 5, under the wear condition of 25 ℃ and 60min, the wear loss is only 0.0084mg; and the abrasion loss of the Q235 substrate was 0.13mg. Therefore, the invention can effectively improve the wear resistance of the material.
Fig. 6 is a zeta potential polarization curve of Q235 steel and AlCoCrFeNiMo (TiC) high entropy alloy prepared by the embodiment of the present invention, and table 1 is a fitting result of fig. 6, and it can be known from the fitting result that the corrosion resistance of the AlCoCrFeNiMo (TiC) high entropy alloy coating is about 130 times that of the Q235 steel substrate, which indicates that the coating has excellent corrosion resistance.
| Corrosion potential (V) | Corrosion current density (A. Cm) -2 ) | |
| AlCoCrFeNiMo(TiC) | -0.2798 | 3.06×10 -7 |
| Q235 steel | -0.631 | 3.98×10 -5 |
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the features described above have similar functions to (but are not limited to) those disclosed in this application.
Claims (10)
1. A ceramic phase and high-melting point phase synergistically enhanced high-entropy alloy coating is characterized in that: the coating is coated on a substrate, the total thickness of the coating is 0.3-1.5mm, the coating is composed of a solid solution phase, a ceramic phase and a high-melting-point phase, the constituent elements of the solid solution phase are Fe, al, co, cr and Ni, the constituent elements of the ceramic phase are Ti and C, the high-melting-point phase is composed of X, and the constituent elements of X are one or more of Mo, nb, ta, V or W.
2. A ceramic phase and high-melting point phase synergistically enhanced high-entropy alloy coating according to claim 1, wherein said solid-solution composition element Fe is diluted from the substrate, the molar ratio of said solid-solution composition elements Al, co, cr and Ni is 1.
3. A high entropy alloy coating of claim 1, wherein the substrate is carbon steel.
4. The ceramic phase and high-melting point phase synergistically enhanced high-entropy alloy coating of claim 1, wherein the coating is prepared by mixing Al, co, cr, ni, ti, C and X, and then performing laser cladding.
5. A method for preparing a high-entropy alloy coating enhanced by the ceramic phase and the high-melting-point phase in cooperation with each other according to any one of claims 1 to 4, comprising the following steps:
s1: polishing the surface of the substrate by using abrasive paper, and drying the polished substrate for later use;
s2: weighing Al, co, cr, ni, ti, C and X powder according to a molar ratio, then uniformly mixing, uniformly coating the alloy powder on the surface of a matrix by using a binder, wherein the thickness of a prefabricated layer is 0.3-1.5mm, and after coating, airing and drying;
the X powder is at least one of Mo, nb, ta, V or W powder;
s3: and (3) performing laser cladding preparation by using a laser body as a heat source to obtain the ceramic phase and high-melting-point phase synergistic enhanced high-entropy alloy wear-resistant coating.
6. The preparation method of the ceramic phase and high-melting point phase synergistically enhanced high-entropy alloy coating according to claim 5, wherein the laser cladding process parameters are as follows: the scanning speed is 15-24mm/s, the power is 1000-2000W, the protective gas flow is 10L/min, the defocusing amount is 35mm, and the overlapping rate is 30%.
7. A method for preparing a high entropy alloy coating of claim 5, wherein the substrate is carbon steel.
8. A method for preparing a high-entropy alloy coating layer with a synergistic enhancement of a ceramic phase and a high-melting point phase according to claim 5, wherein the drying conditions in the step S1 are preheating at 200 ℃ in a drying oven and drying for 2 hours, and the drying treatment conditions in the step S2 are preheating at 70 ℃ in the drying oven and drying for 2 hours; the uniform mixing mode in the step S2 is that the V-shaped powder mixer performs uniform mixing for 2 hours.
9. A method for preparing a high-entropy alloy coating layer enhanced by cooperation of ceramic phase and high-melting point phase according to claim 5, wherein the binder in step S2 is water glass.
10. A method for preparing a coating of a high entropy alloy reinforced by a ceramic phase and a high melting point phase in cooperation with each other according to any one of claims 5 to 9, wherein the molar ratio of Al, co, cr and Ni is 1.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115852361A (en) * | 2022-12-07 | 2023-03-28 | 哈尔滨工业大学 | Wear-resistant high-entropy alloy coating for material surface protection and preparation method thereof |
| CN117305675A (en) * | 2023-09-28 | 2023-12-29 | 沈阳工业大学 | High Wen Gaoshang alloy and preparation method and application thereof |
| CN117604521A (en) * | 2023-12-08 | 2024-02-27 | 齐鲁工业大学(山东省科学院) | Method for improving laser cladding quality of machined chip reconstituted powder in situ |
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| CN111334698A (en) * | 2020-03-15 | 2020-06-26 | 沈阳工业大学 | Wear-resistant high-entropy alloy containing modulation and demodulation decomposition structure and capable of generating hard phase and preparation method of wear-resistant high-entropy alloy |
| CN114540808A (en) * | 2021-11-10 | 2022-05-27 | 兰州荣博特数字智造科技有限公司 | Plasma cladding method for TiC-enhanced Al-Co-Cr-Fe-Ni-Nb high-entropy alloy curved surface coating |
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| JP2016023364A (en) * | 2014-07-25 | 2016-02-08 | 株式会社日立製作所 | Alloy structure |
| CN110129649A (en) * | 2019-06-19 | 2019-08-16 | 辽宁科技大学 | A kind of preparation method of high entropy alloy coating powder and nanocrystalline high entropy alloy coating |
| CN111334698A (en) * | 2020-03-15 | 2020-06-26 | 沈阳工业大学 | Wear-resistant high-entropy alloy containing modulation and demodulation decomposition structure and capable of generating hard phase and preparation method of wear-resistant high-entropy alloy |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115852361A (en) * | 2022-12-07 | 2023-03-28 | 哈尔滨工业大学 | Wear-resistant high-entropy alloy coating for material surface protection and preparation method thereof |
| CN117305675A (en) * | 2023-09-28 | 2023-12-29 | 沈阳工业大学 | High Wen Gaoshang alloy and preparation method and application thereof |
| CN117305675B (en) * | 2023-09-28 | 2024-04-12 | 沈阳工业大学 | High Wen Gaoshang alloy and preparation method and application thereof |
| CN117604521A (en) * | 2023-12-08 | 2024-02-27 | 齐鲁工业大学(山东省科学院) | Method for improving laser cladding quality of machined chip reconstituted powder in situ |
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